Rating issues
This game features combat between human characters. Combat is always seen from pretty far away. Violence either directed at ships/building – which implies violence towards the humans inside, as their actual reactions aren’t seen – or at human land units. These land units are small and non-detailed. The violence itself is unrealistic, as are reactions: units have health-bars, disappear when defeated, don’t have hit animations, and their attacks don’t really connect.
Other issues
One of the cut-scenes in the game depicts a statue of a settler surrounded by two mermaids. The breasts on these mermaids aren’t covered, but the depiction is in a non-sexual way or context, and thus does not affect the age rating.